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diff --git a/share/completions/set.fish b/share/completions/set.fish
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+#
+# Completions for the 'set' builtin
+#
+
+#
+# All locale variables used by set completions
+#
+
+set -g __fish_locale_vars LANG LC_ALL LC_COLLATE LC_CTYPE LC_MESSAGES LC_MONETARY LC_NUMERIC LC_TIME
+
+#
+# Various helper functions
+#
+
+function __fish_set_is_color -d 'Test if We are specifying a color value for the prompt'
+	set cmd (commandline -poc)
+	set -e cmd[1]
+	for i in $cmd
+		switch $i
+
+			case 'fish_color_*' 'fish_pager_color_*'
+				return 0
+
+			case '-*'
+				 
+			case '*'
+				 return 1
+		end
+	end	
+	return 1
+end
+
+function __fish_set_is_locale -d 'Test if We are specifying a locale value for the prompt'
+	set cmd (commandline -poc)
+	set -e cmd[1]
+	for i in $cmd
+		switch $i
+
+			case $__fish_locale_vars
+				return 0
+
+			case '-*'
+				 
+			case '*'
+				 return 1
+		end
+	end	
+	return 1
+end
+
+#
+# Completions
+#
+
+# Regular switches, set only accepts these before the variable name,
+# so we need to test using __fish_is_first_token
+
+complete -c set -n '__fish_is_first_token' -s e -l erase -d (_ "Erase variable")
+complete -c set -n '__fish_is_first_token' -s x -l export -d (_ "Export variable to subprocess")
+complete -c set -n '__fish_is_first_token' -s u -l unexport -d (_ "Do not export variable to subprocess")
+complete -c set -n '__fish_is_first_token' -s g -l global -d (_ "Make variable scope global")
+complete -c set -n '__fish_is_first_token' -s l -l local -d (_ "Make variable scope local")
+complete -c set -n '__fish_is_first_token' -s U -l universal -d (_ "Make variable scope universal, i.e. share variable with all the users fish processes on this computer")
+complete -c set -n '__fish_is_first_token' -s q -l query -d (_ "Test if variable is defined")
+complete -c set -n '__fish_is_first_token' -s h -l help -d (_ "Display help and exit")
+
+# Complete using preexisting variable names
+complete -c set -n '__fish_is_first_token' -x -a "(set|sed -e 's/ /\tVariable: /')"
+
+# Color completions
+complete -c set -n '__fish_set_is_color' -x -a '(set_color --print-colors)' -d (_ Color)
+complete -c set -n '__fish_set_is_color' -s b -l background -x -a '(set_color --print-colors)' -d (_ "Change background color")
+complete -c set -n '__fish_set_is_color' -s o -l bold -d (_ 'Make font bold')
+
+# Locale completions
+complete -c set -n '__fish_is_first_token' -x -a '$__fish_locale_vars' -d 'Locale variable'
+complete -c set -n '__fish_set_is_locale' -x -a '(locale -a)' -d (_ Locale)